1. ATOMIC STRUCTURE MODEL
9th grade physical science

2. CLASS AGENDA
CLE Describe the structure and arrangement of atomic particles.
OBJECTIVE: List the three major subatomic particles and distinguish among their location, charges, and relative masses

3. Task on the table You will be assigned an element and given materials.
You will build a 3-D or flat model representation of one atom of that element
Separate colors must be used for each part of the atom.
A color key must accompany your product.
The atomic model must be scientifically accurate!
The model should have the proper number of protons, neutrons and electrons.
The atomic model must be properly labeled .

4. Ticket out the door
. You must write a brief summary of how you constructed your model and be ready to present to the class.
o The name of the element
o How the electrons are arranged around the nucleus
o Interesting properties that the element contains.
o Who discovered the element
o Where the element can be found
o What the element is used for

5. GRADING RUBRIC MODEL ACCURACY MATERIALS/DESIGN TIMELYNESS
COLOR KEY ACCURACY
SUMMARY
20 PTS
TOTAL 100 PTS

6. Example Models

7. Structure of the Atom
Sections

8. Elements are made up of only one type of atom.
All elements are listed on the Periodic Table.
Each element is represented by its atomic symbol. 8

9. Some symbols come from the elements name.
Atomic Symbols
Some symbols come from the elements name.
Example: C is for Carbon
Others come from the element’s Latin name.
Example:
Au is for Gold (aurum)
Pb is for Lead (plumbum) 9

10. FORMULAS
COMPLETE BOTH SIDES OF WORKSHEET FROM YESTERDAY! NO TALKING!!!!
MODELS TOMORROW!!!!
PROTONS= ATOMIC NUMBER
ELECTRONS=PROTONS
NEUTRONS= MASS NUMBER – ATOMIC NUMBER

11. Some symbols come from the elements name.
Atomic Symbols
Some symbols come from the elements name.
Example: C is for Carbon
Others come from the element’s Latin name.
Example:
Au is for Gold (aurum)
Pb is for Lead (plumbum) 11

12. About Atoms Atoms are so small they can’t be seen with visible light.
Photographs of atoms can be seen by a scanning tunneling microscope.
The atom is actually made up of smaller subatomic particles.
Proton-positive charge
Electrons-negative charge
Neutrons-no charge 12

13. The Nucleus Nucleus contains protons and neutrons.
The electrons can be found surrounding the nucleus in the electron cloud.
Electrons are very far away from the nucleus.
There is actually a lot of empty space between the nucleus and electrons. 13

14. Isotopes The number of protons tells us the atomic number of the atom.
The mass number is the total number of protons and neutrons in the nucleus.
Atoms can have different numbers of neutrons.
Atoms that have different numbers of neutrons are called isotopes. 14

15. What do these numbers mean?
Mass Number Li 7
Element Symbol 3
Atomic Number
How many protons does lithium have?
How many neutrons does lithium have?

16. Atomic Mass The atomic mass is NOT the same as the mass number.
The atomic mass shown on the periodic table is an average of all the isotopes of that element.
Atomic #=# of protons
Electrons=atomic #=# of protons
Neutrons=mass # - atomic # 16